Transmitting apparatus for use in wireless telegraphy and telephony.



G. macaw. TRANSMITTING APPARATUS FORUSE IN WIRELESS TELE GRAPHY AND TELEPHONY APPLICATION FILED DEC. 3h I913- Patented A 20, 1945. I-

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To all whom it may concern a subject of the King of Italy, residing at Marconi House, Strand, London, England, have inyented new and useful Improvements in. Transmitting Apparatus for Use in Wire less Telegraphy and Telephony, of which the following is a specification,

This invention relates to improvements in transmitting apparatus for use in wireless ous oscillations or groups oi continuous oscillations may be generated.

The accompanying drawings illustrate my invention, Figure 1 being a diagrammatic representation of a transmitter constructed in accordance therewith While Fig. 2 is a similar representation of a modified form.

'70 7a is a split condenser which can be charged by a source of current a which is prefierably continuous through an inductive resistance a key Z) being included in the circuit. From the middle of the condenser is 7 a plurality of condensers c c c? is connected each through an inductive resistance i i i to pairs of terminals 1" t, i 25 t t. The outer plates of the condenser is k are connected one to each or a pair of toothed disks d cl fast on the same rapidly rotating shaft 6. The teeth on the two disks and the terminals t t, t t, 5' 2? are so arranged that as the teeth pass the terminals the condensers c c c are charged in. the same direction and then discharged in succession and then charged in the opposite impulses in synchronism with its naturaltirne period.

In the modification shown in Fig. 2 instead-of having three inductive resistances connected one to each of the condensers cc 0 two inductive resistances? i are employed between the condenser k In ahd the disks d d and these resistances act as rimaries toisecon laries s s in the oscil- Eating circuit :0. In this case the interval Specification of Letters Patent.

Application filed December 31, 1913. Serial Ito. $09,711.

between successive discharges is equal to or a multiple of the natural time period of the aerial.

All the circuits c t is d, c 2' is d, c v? k d, c i is J, c t is (Z, c i k 65' should bein resonance with the circuit 0 and with the aerial. Similarly the circuits 0' is i i, 0 A! 2? cl, 0 in i d, c is 2' 05 should bein resonance with the'circuit 0 and with the serial. I

I may employ a larger odd number of Working condensers the primaries being wound alternately in opposite directions so that the aerial is impulsed in opposite dirotations alternately or otherwise in synchronism' With its natural period of electrical oscillation the spacing ot-the teeth and the speed of rotation of the disks being suitably arranged. The primaries may however be all wound the same way the aerial being impulsed once every complete period of oscillotion or otherwise in synchronism with its natural period, in which case I am not limited to employing an odd number of working condensers.

Qne half of. the split condenser may be short-circuitedand if the inductance ot the generator he sufiiciently low, the other half omitted.

What I'claixn is l. The combination of a plurality of 53cm densers in parallel, and means for chargingthem with electricity in opposite directions alternately and for discharging them in regular succession through inductive resist ances substantially as described.

2. The combinationcf a plurality of condensers in parallel, means for charging them with electricity and a rotating disk adapted to discharge the condensers in succession through. inductive resistances and a second rotating disk adaptedxto discharge the con dcnsers in succession after the first disk has done so. I i 7 3. The combination of a plurality of condensers in parallel, means for charging them with electricity in op osite directions alternately, a plurality o inductive resistances, means for discharging the condensers in regular succession through the resistances and a winding having portions adapted to act as secondaries to the primaries formed by the resistances.

aerial inductively coupled to densers in parallel, means for charging them v in opposite dlrectlons alter with electricity nately, a plurality of-inductive resistances, means-for discharging the condensers in regular succession through the resistances and an oscillating circuit having portions adapted to act as secondaries fOtlle primaries formed by the resistances, and an this clrcuit.

a inding havas secondarles the inductive ing portions adapted to act to the primaries formed 'by resistances, and means for charging the can densers with electricity in cppiisite directions alternately and for discharging them in regular siicce'ssion. y

6. The combination of a plurality of e0ndensers in parallel, an inductive resistance Y 5*! The combination of a plurality of eon- I. deneers in parallel, an inductive resistance connected to each condenser,

- Witnesses:

aieaev? oscillating to act as connected to each condenser, an circuit having portions adapted "secondaries to the primaries formed bythe inductive resistances, means for charging the condensers with electricity in opposite directions alternately and for discharging them 111 regular succession, and an aerial inductively coupled to the oscillating circuit.

The combination of a plurality'of c0ndensers in parallel and -means comprising rotating spark gaps for charging thenri with electricity in opposite directions alternately and for discharging them in regular succession through inductive resistance; substantiallyi as described.

GUGLIE-LMO MARCONI.

, W; L. Manna,

J. ST. VINCENTPLETTS. 

